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I'm assuming that by journaling the file you didn't need to set the isolation level in the persistence.xml in the end however, did you ever get the override to work? I am setting the isolation level to 2 (READ_COMMITTED) but the SQL Performance Monitor on the iSeries has proved this did not work as it is remains at Read Stability (REPEATABLE_READ). Is there somewhere else I need to set READ_COMMITTED isolation level? I am using Hibernates JPA v3.3.1 and Spring Core 2.5.6.

I have been struggling with this for some time and have posted on the Hibernate forum but no answers yet.